Monday, February 27, 2012 2:07 PM
Hi all, i posted something similar last week but i was a little unclear therefore got unclear replies.
I have an AD integrated DNS zone.
I have a number of servers one of which has two network cards. The two network cards are in different subnets with different IP addresses (however only one of the network cards / subnets is used the other network card should be disabled). One of my guys had a move around in the server room last week and connected the LAN cable into the wrong network card on the server.
As a result of the above, the server (with two network cards) is now appearing in DNS with two A records (an A record for each network card / subnet). Even though the network cable has been reconnected to the correct network card and the incorrect A record has been deleted from DNS the incorrect A record reappears the next day!!
Im not sure if i have explained this very well.
Any suggestions would be much appreciated.
Monday, February 27, 2012 2:14 PM
Please make sure that the NIC card is disabled. Delete the A record, force the AD replication between all DCs you have and check results.
Monday, February 27, 2012 2:21 PM
thank you for your reply
I have disabled the NIC but did not force replication will this have made any difference?
Monday, February 27, 2012 3:29 PMto add to this, the server with two network cards is only a member server
Monday, February 27, 2012 4:26 PM
i have just found that another device on the LAN is using the same IP address the 2nd network card was using and registering in DNS. The other device is only a windows 7 machine, the device has a totaly different name from the server so i am 100% confused now
Tuesday, February 28, 2012 3:41 AMModerator
Does the reappear A record indicate the FQDN of the member server? Please verify that the 2nd NIC was disabled, and delete the 2nd NIC IP address A record. Then, run ipconfig /registerdns on both the server and Windows 7, to see if the record reappear and which FQDN name is indicate on the record.
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- Edited by Aiden_CaoMicrosoft Contingent Staff, Moderator Tuesday, February 28, 2012 4:42 AM
Tuesday, February 28, 2012 9:55 AM
i have just noticed that most devices on the network have 2 or more ip addresses in DNS!!!
only one of the ip addresses per host is showing in dhcp but both ip addresses (shown in DNS) respond to ping
now im lost
Thursday, March 01, 2012 2:27 AMModerator
It can cause by DHCP register multiple A records on DNS, but the staled record was not deleted by DNS. Please try to enable Scavenging on DNS. It will help DNS to delete the expired records.
Understanding aging and scavenging
Enable Aging and Scavenging for DNS
Don’t be afraid of DNS Scavenging. Just be patient
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- Proposed As Answer by Aiden_CaoMicrosoft Contingent Staff, Moderator Sunday, March 04, 2012 8:54 AM